The ecological rationality of delay tolerance: insights from capuchin monkeys

Both human and non-human animals often face decisions between options available at different times, and the capacity of delaying gratification has usually been considered one of the features distinguishing humans from other animals. However, this characteristic can widely vary across individuals, species, and types of task and it is still unclear whether it is accounted for by phylogenetic relatedness, feeding ecology, social structure, or metabolic rate. To disentangle these hypotheses, we evaluated temporal preferences in capuchin monkeys, South-American primates that, despite splitting off from human lineage approximately 35 million years ago, show striking behavioural analogies with the great apes. Then, we compared capuchins’ performance with that of the other primate species tested so far with the same procedure. Overall, capuchins showed a delay tolerance significantly higher than closely related species, such as marmosets and tamarins, and comparable to that shown by great apes. Capuchins’ tool use abilities might explain their comparatively high preference for delayed options in inter-temporal choices. Moreover, as in humans, capuchin females showed a greater delay tolerance than males, possibly because of their less opportunistic foraging style. Thus, our results shed light on the evolutionary origins of self-control supporting explanations of delay tolerance in terms of feeding ecology.     

Toward a More Complete Understanding of Bystander Willingness to Help: What Role Does Critical Consciousness Play?

Sexual assault is a common phenomenon on university campuses with about one in five women victimized while in college. Consequently, bystander intervention programs have been gaining momentum. To improve such programs, research has begun to identify factors that may facilitate or impede individuals’ willingness to help a potential victim of sexual assault. The current study adds to this literature by: (a) examining potential differences in rape myth acceptance, critical consciousness, and willingness to help based on types of self-reported exposure to sexual assault; (b) exploring the previously unexamined mediating role of critical consciousness in the relationship between exposure to sexual assault and willingness to help; and (c) clarifying how the extent of rape myth acceptance impacts the relationship between exposure to sexual assault and willingness to help. Using a sample of 511 U.S. undergraduate students, results generally demonstrated that those with multiple types of exposure to sexual assault victimization demonstrated the highest levels of critical consciousness and greater willingness to help. Additionally, there was both a significant indirect effect of exposure to sexual assault on willingness to help via critical consciousness and a conditional effect of exposure to sexual assault on willingness to help that was stronger at lower levels of rape myth acceptance. Results highlight the importance of programming targeted at increasing critical consciousness.

     

Oral administration of guanosine impairs inhibitory avoidance performance in rats and mice

Extracellular guanine-based purines, mainly the nucleoside guanosine, have recently been shown to exert neuroprotective effects, which seem to be related to antagonism of the glutamatergic system. In this study, we investigated the effects of acute oral administration of guanosine on inhibitory avoidance task in rats and mice. We also studied its effects on locomotor activity, anxiety-related behaviors and mechanisms of action involving the purinergic system. Guanosine (2.0 and 7.5mg/kg, per os), administered 75min pretraining, dose-dependently impaired retention of the inhibitory avoidance task in rats and mice, an effect not prevented by the adenosine receptor antagonist caffeine. Guanosine presented no effects on locomotor activity and anxiety-related behaviors. This amnesic effect of guanosine may be compatible with inhibition of glutamatergic system and seems to be not mediated by adenosine.     

Promoting Mental Health in Disadvantaged Preschoolers: A Cluster Randomized Controlled Trial of Teacher Training Effects

The literature provides solid documentation of the negative consequences of poor psychosocial functioning and behavioral problems in early childhood. Children facing economic disadvantage are at higher risk for poor socio-emotional development and problem behaviors, which draws attention to the need for prevention targeted at this risk group. The aim of our study was to analyze the impact of an evidence-based teacher-training program, the Incredible Years Teacher Classroom Management (IY-TCM), on the behavior of economically disadvantaged Portuguese children. Participants were 1030 children aged 3–6 years, from 65 preschool classrooms selected for their high percentage of children from economically disadvantaged backgrounds. The study followed an experimental randomized controlled between-group design, with pre- and post-intervention assessments. Teachers in the experimental group attended the IY-TCM program, implemented in six monthly workshops, and four sessions of individual in-class support. Children outcomes were evaluated with the Preschool and Kindergarten Behavior Scales—2nd Edition (Social Skills and Problem Behavior scales). After the intervention, preschoolers in the IY-TCM classrooms showed more improvements in their social skills and more decreases in problem behavior. Children with lower levels of social skills (high risk) at pre-intervention and those coming from families in economic need showed greater improvements in social skills, but these effects were not observed for problem behavior. Results support the growing evidence of the effectiveness of the IY-TCM as a stand-alone, non-adapted program in a Portuguese cultural context, which can play a protective role in children’s lives and thus bridge the gap between children coming from different economic backgrounds.     

Usage-based account of the acquisition of liaison: evidence from sensitivity to the singular/plural orientation of nouns

This study investigates whether children’s production and recognition of obligatory liaison sequences in French depend on the singular/plural orientation of nouns. Certain nouns occur more frequently in the plural (e.g., arbre “tree”), whereas others are found more often in the singular (e.g., arc-en-ciel “rainbow”). In the input, children more frequently encounter these plural-oriented nouns after determiners that indicate plurality (e.g., les,des “the”, deux “two”) and that are often associated with a /z/ liaison (e.g., deux arbres [døzarbr] “two trees”). In Experiment 1, 122 children (3 years 2 months to 6 years 3 months of age) were asked to produce nominal phrases with either /z/ liaisons (i.e., in plural contexts such as deux ours [døzurs] “two bears”) or /n/ liaisons (i.e., in singular contexts such as un ours [nurs] “one bear”). We found correlations between the plural orientation of the nouns and (a) the probability that they will be preceded by an incorrect /z/ liaison in the singular context and (b) the probability that they will be preceded by a correct /z/ liaison in the plural context. This result was, however, restricted to the younger children. In Experiment 2, 20 children (5 years 5 months to 6 years 3 months of age) were asked to monitor target words in auditorily presented sentences. The results showed shorter reaction times for singular-oriented nouns when preceded by a singular determiner than when preceded by a plural determiner. Conversely, plural-oriented nouns were responded to faster when preceded by a plural determiner than when preceded by a singular determiner. Results are discussed within the framework of a two-stage model of liaison acquisition recently proposed by Chevrot, Chabanal, and Dugua (Journal of French Language Studies,17 [2007] 103-128) as well as by Chevrot, Dugua, and Fayol (Journal of Child Language [in press]).     

Aberrant paralimbic gray matter in criminal psychopathy

Psychopaths impose large costs on society, as they are frequently habitual, violent criminals. The pervasive nature of emotional and behavioral symptoms in psychopathy suggests that several associated brain regions may contribute to the disorder. Studies employing a variety of methods have converged on a set of brain regions in paralimbic cortex and limbic areas that appear to be dysfunctional in psychopathy. The present study further tests this hypothesis by investigating structural abnormalities using voxel-based morphometry in a sample of incarcerated men (N=296). Psychopathy was associated with decreased regional gray matter in several paralimbic and limbic areas, including bilateral parahippocampal, amygdala, and hippocampal regions, bilateral temporal pole, posterior cingulate cortex, and orbitofrontal cortex. The consistent identification of paralimbic cortex and limbic structures in psychopathy across diverse methodologies strengthens the interpretation that these regions are crucial for understanding neural dysfunction in psychopathy.     

Organizational Stress and Coping in U.S. Professional Soccer

The present study was an exploration of organizational stressors perceived by U.S. professional soccer players, and the coping strategies they employed to manage these stressors. Eight players (four female and four male) were interviewed during pre-season training camps. Results of data analysis revealed that contracts, draft, league and team structure, coach-athlete interaction, salaries, and travel demands were the most commonly cited areas of stress. Participants used avoidance, problem-focused, and social support coping strategies to manage these organizational stressors. In conclusion, more concern should be placed on the impact that organizational stressors can have on athletic performances.     

Reports from the Front: The Effects of Hurricane Katrina on Mental Health Professionals in New Orleans

Hurricane Katrina created an unprecedented mental health crisis in New Orleans. Once they could return to work, local mental health professionals attempted to treat survivors of the storm while dealing with the storm's impact on themselves. Those working in public settings were offered in-service training and supervision. But clinicians in private practice often found themselves bearing the brunt of posttraumatic uncertainty alone. The current paper includes four experiential reports from area clinicians describing their early struggles to maintain a sense of continuity in their ongoing clinical work, only to realize how much of the personal is also professional in the aftermath of a disaster of this magnitude, and how personal and professional inevitably inform one another when clinicians and patients survived similar dangers and losses. The introduction locates these four papers in the larger context of post-Katrina New Orleans and a program that was specifically tailored to meet the needs of local clinicians. This program demonstrated the ways in which psychoanalytic ideas can be used to give meaning to a traumatized mental health community's profound disorientation.